RE: WD90C24 Anyone?

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> [mailto:devel-admin@xxxxxxxxxxx] On Behalf Of Tim Roberts
> chris@xxxxxxxxxxxx wrote:
> > I have an old ThinkPad 750P. It uses the WD90C24 chip, which was in 
> > the old svga driver.
> >
> > What would it take to port that to the new XFree86 code? 
> I'm not above 
> > writing assembly code or digging in here, I just don't know 
> where to 
> > start or how much effort it might take... swatting a fly or 
> eating an 
> > elephant?
> 
> Holy moly!  You have a whopping 1 megabyte of video RAM there.
> 
> Will it work with the VESA fb driver?  If not, then you might 
> as well give up.  I have the source code for their old 
> Windows 3.1 driver, and it is more than 76,000 lines of 
> 16-bit x86 assembler.  The blitter provided virtually no 
> acceleration, so you won't really be giving anything up to 
> use the fb driver.

This machine didn't quite get the VESA in firmware. It was
provided by a DOS TSR, which was required for the Win3.1 and
Win95 drivers. I thought it was for use with VESA, but now I'm
not sure.

Anyway, I don't think it's a good idea to require a DOS TSR
for video in Linux.

There is source for this chip somewhere in the annals of X
code. I think XFree86 supported it as late as 3.1.

The only mode I've seen with modern distributions is 320x200x1.
It's not pleasant.

I'd also like to get the pen interface to work on it, but one
step at a time! :)

So what's that next step?

Chris

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